Walter who? Bryan Cranston is a long way from “Breaking Bad” in the trailer for HBO Films’ “All the Way,” in which he plays President Lyndon B. Johnson.

Based on the play by Robert Schenkkan, for which Cranston won a Tony after a six-month Broadway stint in 2014, “All the Way” follows Johnson’s ascension to the presidency following the assassination of President John F. Kennedy.

Cranston said he didn’t hesitate when the offer to adapt “All the Way” came in from HBO because the lesson of the play, about the moral and political courage it took Johnson to push forward on the Civil Rights Act in 1964, was so vital.

“We could now reach millions more and tell this important story by way of HBO,” Cranston said at TCA in January.

Anthony Mackie co-stars as Martin Luther King Jr. Also starring are Melissa Leo as Lady Bird Johnson and Bradley Whitford as Hubert Humphrey.

In addition to the Tony, the role won Cranston the Drama Desk, Outer Critics Circle and Theater World Awards.

“All the Way” will be produced for HBO by Amblin Television, Tale Told Productions and Moon Shot Entertainment, with Steven Spielberg, Darryl Frank & Justin Falvey, Robert Schenkkan and Cranston executive producing, and James Degus co-executive producing.

I saw the play, it’s perfect for TV — because it is utterly superficial, and anyone playing LBJ gets to chew the scenery and spit it right back out. They’re blessed to have gotten Bryan Cranston, he does that so well. And it looks like they developed the black characters beyond the token characters in the play, so that’s something. Hope the women fare as well (maybe Coretta and Lady Bird will actually seem like real people now). It was, without a doubt, a white man’s play. Let’s see what they’ve done for HBO.